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"Move as millions. Survive as one." That's the catchphrase of this seven-part event for which a National Geographic team spent two-plus years recording across 20 countries and all seven continents. Narrated by Alec Baldwin, it tells the stories of many of the planet's species and the journeys they undertake to ensure their survival. The diverse range of animals shown -- many revealing behaviors never caught on film before -- include Botswana zebras, Mali elephants, flying foxes in Australia, Pacific white sharks, and the white-eared kob of the Sudan, thought to have been destroyed during decades of violence.

Dr. Brady Barr, a herpetologist by trade, travels all over the world to study reptiles and other creatures in their native habitats, often risking his life in the process. His mission is two-fold: to collect as much information as possible about the animals he studies and to inform the public about the state of the planet and the risk of extinction many animal species face. And, of course, there's another benefit to all his work: It makes great TV.

Stunning computer animation brings the most ferocious giants of the Ice Age back to life, creating a portrait of their wild existence and puzzling extinction. Also, details about their lives and disappearance are revealed through the work of paleontologists, who uncover fossilized bones of these lethal creatures.

From the award-winning team of filmmaker Darren Aronofsky ("Black Swan") and producer Jane Root ("America the Story of Us"), this 10-part cinematic event series explores the fragility and wonder of planet Earth -- one of the most peculiar, unique places in the universe. Host Will Smith guides viewers on an unprecedented exploration, bolstered by an elite group of eight astronauts who provide unique perspectives and relate personal memoirs of the planet seen from a distance. Hourlong episodes delve into monumental events such as genesis, cosmic violence, human intelligence and alien life, oxygen, and survival vs. destruction.

Adventurer/survivalist Bear Grylls hosts and narrates this six-part docuseries, which draws attention to the volatility of Mother Nature and the resilient animals that survive Earth's most extreme habitats. Each hourlong episode characterizes one of the planet's roughest environments -- including jungles, mountains, deserts, oceans, the poles and grasslands -- and how each of its inhabitants acclimate to its turn of events. As Grylls guides viewers through these extreme locations, the incredible ways in which animals have adapted to survive against all odds are celebrated. As well, underscored is a sense of urgency to the effects of climate change.

Maritime mysteries -- old and new -- come to life in this 10-episode series, combining scientific data and digital re-creations to reveal shipwrecks, treasures, and sunken cities on the bottom of lakes, seas and oceans around the world. Innovative technology allows viewers to see what lies on the floors of large bodies of water such as the Gulf of Mexico, the Nile, the Indian Ocean, the Baltic Sea and the Atlantic Ocean as if they had been drained. Then, in a quest to explain natural wonders and man-made catastrophes, stories tell of how vessels sank, what ancient geological formations reveal about life on Earth, where Nazi secrets now reside, and why so many continue to search for the legendary city of Atlantis.

This award-winning series presents compelling untold stories and covers a wide array of provocative subjects. "Explorer" aired for 25 years -- the longest-running documentary series in cable TV history -- before being relaunched in 2015 after a five-year hiatus. Each monthly episode of the new "Explorer" takes a similar deep dive inside a story from the pages of a recent National Geographic magazine issue, taking viewers not only to the most remote corners of the globe but also to the furthest reaches of the mind and deepest crevices of history -- on urgent missions of discovery.

The naturalist, broadcaster and writer continues to be intrigued by certain animals, despite a lifelong career of wildlife filmmaking. In "David Attenborough's Natural Curiosities," he highlights some of nature's evolutionary anomalies and how curious critters baffle and fascinate scientists. Each episode features two animals, linked by a common theme, who adapt to their environments in unusual ways. Filmed throughout the U.K., stories of nature turning the ordinary into the extraordinary are showcased with Attenborough's storytelling and amazing images of the animals.